Pakistan Taliban release 'police killing' video
18 July 2011 Last updated at 13:15 BST
Footage appearing to show the execution-style killing of 16 policemen in the tribal north-west of Pakistan has been released by the Taliban.
The video shows policemen lined up on a hillside with their hands tied behind their backs in front of gunmen who open fire on them.
Pakistan's army spokesman told the BBC the video appeared to be authentic.
Aleem Maqbool reports from Islamabad.